Mechanical Property and Deformation Behavior of SOFCs

doi:10.15541/jim20140573

Abstract

Abstract:

Anode-supported planar solid oxide fuel cells (SOFCs) were successfully fabricated by tape casting, screen printing, and co-sintering technologies. Evaluated by the ring-on-ring and double-torsion technique, the flexure strength and fracture toughness of the single-cell are 156.69 MPa and 2.51 MPa•m^1/2, respectively. And after the anode support being reduced from ceramic (NiO/YSZ) to cermet (Ni/YSZ), the flexure strength and fracture toughness change to be 104.48 MPa and 3.95 MPa•m^1/2, respectively. Cell flexural deformation test indicates that with reduction of the anode support, the flexural deformation increases, the force for flattening cell increases (from 108 N to 184 N), and the rupture-resisting performance is enhanced. In conclusion, with notable improvement of cell fracture toughness after anode support reduction, the adverse influence caused by flexural deformation can be effectively mitigated and the comprehensive mechanical property can be improved.

Key words: SOFC, flexure strength, fracture toughness, flexural deformation

CLC Number:

TQ174

LIANG Ling-Jiang, LI Kai, YAN Dong, MA Ben, YANG Jia-Jun, PU Jian, CHI Bo, LI Jian. Mechanical Property and Deformation Behavior of SOFCs[J]. Journal of Inorganic Materials, 2015, 30(6): 633-638.

Figures/Tables 9

Fig. 1 Processing diagram for fabrication of anode supported SOFC cells

Fig. 2 Schematic diagram of double torsion technique of ceramic samples

Fig. 3 Points distribution diagram for flexural deformation test of SOFC cell

Fig. 4 XRD patterns of the NiO/YSZ anode before and after reduction

Fig. 5 Relationship between flexure strength and deformation of cells before and after anode reduction

Fig. 6 Flexure strength and fracture toughness of cells before and after anode reduction

Fig. 7 Cross-sectional microstructures of anode supported cells before (a, c) and after (b, d) reduction

Fig. 8 Flatness distribution diagram of cells

Fig. 9 Relationships between force and deformation of cells

References 18

[1]	毛宗强. 燃料电池. 北京:化学工业出版社, 2005: 1-2.
[2]	李瑛, 王林山. 燃料电池. 北京:冶金工业出版社, 2003: 1-10.
[3]	LI JIAN.Solid oxide fuel cells: development status and key technologies.Journal of Functional Materials and Devices, 2007, 13(6): 683-690.
[4]	KIM S, MOON H, HYUN S, et al.Ni-YSZ cermet anode fabricated from NiO-YSZ composite powder for high-performance and durability of solid oxide fuel cells.Solid State Ionics, 2007, 178(21/22): 1304-1309.
[5]	LIN C K, CHEN T T, CHYOU Y P, et al.Thermal stress analysis of a planar SOFC stack.Journal of Power Sources, 2007, 164(1): 238-251.
[6]	MALZBENDER J, STEINBRECH R W.Advanced measurement techniques to characterize thermo-mechanical aspects of solid oxide fuel cells.Journal of Power Sources, 2007, 173(1): 60-67.
[7]	RADOVIC M, LARA-CURZIO E.Mechanical properties of tape cast nickel-based anode materials for solid oxide fuel cells before and after reduction in hydrogen.Acta Materialia, 2004, 52(20): 5747-5756.
[8]	LI W, HASINSKA K, SEABAUGH M, et al.Curvature in solid oxide fuel cells.Journal of Power Sources, 2004, 138(1/2): 145-155.
[9]	CHUNG B W, CHERVIN C N, HASLAM J J, et al.Development and characterization of a high performance thin-film planar SOFC stack.Journal of the Electrochemical Society, 2005, 152(2): A265.
[10]	DEY T, GHOSH P C, SINGDEO D, et al.Diagnosis of scale up issues associated with planar solid oxide fuel cells.International Journal of Hydrogen Energy, 2011, 36(16): 9967-9976.
[11]	LUO JUN, YAN DONG, FANG DA-WEI, et al.Electrochemical performance and thermal cyclicability of industrial-sized anode supported planar solid oxide fuel cells.Journal of Power Sources, 2013, 224: 37-41.
[12]	ASTM C1499-05, Standard Test Method for Monotonic Equibiaxial Flexural Strength of Advanced Ceramics at Ambient Temperature.
[13]	BECKER T H, MARROW T J, TAITR B, et al.An evaluation of the double torsion technique.Experimental Mechanics, 2011, 51(9): 1511-1526.
[14]	ASTM E562-02, Standard Test Method for Determining Volume Fraction by Systematic Manual Point Count.
[15]	WANG JIE, YAN DONG, PU JIAN, et al.Fabrication and performance evaluation of planar solid oxide fuel cell with large active reaction area.International Journal of Hydrogen Energy, 2011, 36(12): 7234-7239.
[16]	YAN DONG, BIN ZHU, FANG DA-WEI, et al.Feasibility study of an external manifold for planar intermediate-temperature solid oxide fuel cells stack.International Journal of Hydrogen Energy, 2013, 38(1): 660-666.
[17]	PIHLATIE M, KAISER A, MOGENSEN M.Mechanical properties of NiO/Ni-YSZ composites depending on temperature, porosity and redox cycling.Journal of the European Ceramic Society, 2009, 29(9): 1657-1664.
[18]	MALZBENDER J, FISCHE R W, STEINBRECH R W.Studies of residual stresses in planar solid oxide fuel cells.Journal of Power Sources, 2008, 182(2): 594-598.